package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.conditions.update.UpdateChainWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class DishServiceImpl extends ServiceImpl<DishMapper,Dish> implements DishService {
    @Autowired
    private DishFlavorService dishFlavorService;


    /**
     * 新增，修改菜品同时保存对应的口味数据
     * @param dishDto
     */

    @Transactional
    public void saveWithFlavor(DishDto dishDto) {
        //保存菜品的基本信息到菜品表dish
        this.save(dishDto); //插入后dish_id已经赋值了
        Long dishId = dishDto.getId(); //dish.id = dish_Flavor.id

        //菜品口味
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors=flavors.stream().map((item)->{
            item.setDishId(dishId); //同时设置测菜品口味的id
            return item;
        }).collect(Collectors.toList());

        //保存菜品口味到表dish_flavors中
        dishFlavorService.saveBatch(flavors);
    }


    /**
     * 逻辑 1、先从dish表查询出对应信息
     *     2、再从dishFlavor查询出对应信息（DishFlavor.DishId=dish.id）
     *     3、把dish表的信息拷贝给dishDto，因为dishDto包含dish和dishFlavor的信息
     *     4、设置dishDto的Flavors口味信息（再从dishFlavor查询出对应信息（DishFlavor.DishId=dish.id）
     * @param id
     * @return
     */
    @Override
    //根据对应的id查询菜品信息和口味信息
    public DishDto getByIdWithFlavor(Long id) {
        //查询菜品信息,从dish表查询
        Dish dish = this.getById(id);
        DishDto dishDto = new DishDto();
        //把菜品信息拷贝到dishDto中
        BeanUtils.copyProperties(dish, dishDto);

        //查询口味信息,从dishFlavor表查询
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,dish.getId());//DishFlavor.DishId=dish.id
        List<DishFlavor> flavorList = dishFlavorService.list(queryWrapper);
        //把查询到的口味信息赋值到拷贝后的dishDto里
        dishDto.setFlavors(flavorList);
        return dishDto;
    }

    /**
     * 思路：1、先更新dish基础表
     *      2、然后把dishFlavor表的信息给清除了
     *      3、在设置提交过来的口味信息，然后设置dishId=提交的id->DishDto.getId
     *      4、然后再批量保存设置完的id
     * @param dishDto
     */
    @Transactional
    @Override
    public void updateWithFlavor(DishDto dishDto) {  //dishDto继承了Dish
        //更新dish表基本信息
        this.updateById(dishDto);
        //清理当前菜品对应口味数据---dish_flavor表的delete操作
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId,dishDto.getId());
        dishFlavorService.remove(queryWrapper);
        //添加当前提交过来的口味数据---dish_flavor表的insert操作
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors = flavors.stream().map(
                (item)->{
                    item.setDishId(dishDto.getId());
                    return item;
                }
        ).collect(Collectors.toList());
        dishFlavorService.saveBatch(flavors);

    }

    @Override
    public void removeWithDishFlavors(List<Long> ids) {
        //查询套餐状态，确定是否可以用删除
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Dish::getId,ids);
        queryWrapper.eq(Dish::getStatus,1);
        int count = this.count(queryWrapper);
        if (count>0){
            //如果不能删除则抛出一个业务异常
            throw new CustomException("套餐正在售卖中不能删除");
        }
        //如果可以删除，先删除菜品中的数据--Dish
        this.removeByIds(ids);
        //删除关联表的数据Dish_Flavors
        LambdaQueryWrapper<DishFlavor> objectLambdaQueryWrapper = new LambdaQueryWrapper<>();
        objectLambdaQueryWrapper.in(DishFlavor::getDishId,ids);
        dishFlavorService.remove(objectLambdaQueryWrapper);
    }


}
